The Blue Book of Grammar and Punctuation



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Periods

Rule 1. Use a period at the end of a complete sentence that is a statement.
Example: I know that you would never break my trust intentionally.

Rule 2. If the last word in the sentence ends in a period, do not follow it with another period.
  Examples: I know that M.D. She is my sister-in-law.
    Please shop, cook, etc. I will do the laundry.

Rule 3. Use the period after an indirect question.
Example: He asked where his suitcase was.
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